Inspection Procedure

1. Start the engine.
2. Turn the ECT SNOW switch "OFF" (Normal drive mode).
3. Confirm vehicle response by driving from a parked position to fully depressing the accelerator pedal.
4. Turn the ECT SNOW switch "ON" and perform the same check as (c).

   Confirm that there is a difference between ECT SNOW switch "ON" and "OFF".

   • Driving test should be done on a paved road (a nonskid road).
   • Make sure not to use the TRAC system when testing a vehicle equipped with one.

     OK: 

     There is a difference in acceleration between "ON" and "OF". 

1. NG: Go to step 2 
2. OK: GO TO NEXT STEP. 

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE  PROBLEM SYMPTOMS TABLE   ) 

1. Disconnect the connector of pattern select switch.
Fig 1: Identifying Pattern Select Switch Assy No. 1 Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in Fig 2 below.

   Standard: 

   Fig 2: Pattern Select Switch Assy No. 1 - Body Ground Resistance Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
2. OK: Go to next step. 

1. Measure the resistance according to the value(s) in Fig 4 below.
   Fig 3: Identifying Pattern Select Switch Assy No. 1 Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   Fig 4: Pattern Select Switch Assy No. 1 Resistance Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPLACE PATTERN SELECT SWITCH ASSY NO. 1 
2. OK: Go to next step. 

1. Connect the connector of pattern select switch.
2. Disconnect the passenger side junction block assy (multiplex network body ECU) connector.
3. Measure the resistance between terminal SNOW of passenger side junction block assy (multiplex network body ECU) and body ground.

   Standard: 

   Fig 5: Terminal SNOW Of Passenger Side Junction Block Assy Resistance Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 6: Identifying Passenger Side Junction Block Assy ECU Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
2. OK: GO TO NEXT STEP. 

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE  PROBLEM SYMPTOMS TABLE   )